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这部分引脚一般不需要配置，悬空即可，要了解更多他们的配置模式请阅读硬件手册和处理器参考手册。

Boot_CFGx：引脚配置，红色的表示和SD卡启动不同的位置：

信号名配置引脚名SD卡启动(usdhc1)128MB/256MB NAND启动512MB/1GB NAND启动emmc(usdhc2)
X_LCD_D[7:0]BCFG1[7:0]01000100,00101001,00101001,00110110,0000
X_LCD_D[15:8]BCFG2[7:0]0010,000000100,00000000,0000000100,00001000
X_LCD_D[23:16]BCFG4[7:0]0000,00000000,00000000,00000000,0000

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